Brown Sugar Icing

My birthday is coming up this Monday! So that means.....time to test out a new recipe! I use myself as the guinea pig because if it doesn't turn out...I am the only one that is upset about it. Anyway--I have chosen Caramel Cake with Brown Sugar Frosting posted by newlywedws. Since I have never made it before, is brown sugar frosting something that can be used to decorate with at all or just to slather it on? I was thinking maybe just piping ruffles or the petal effect--would this work? Thanks so much!